摘要
Abstract
The engineering properties of loess is very complex. In areas where the groundwater are unusually rich, loess are often accompanied by the characters of collapsibility, large deformation, high earth pressure etc. So construction excavation in loess area usually causes tunnel support cracking, surrounding rock collapsing and so on. In this paper, Zhangmao Tunnel in Zhengzhou - Xi'an Passenger-dedicated Railway Line is taken as an example. By means of study on surrounding rock's mechanics properties and construction technology of this tunnel, the paper analyzes and summarizes the three-bench seven-step excavation method. Moreover, this paper offers some construction methods and key points of controlling effectively settlement and deformation. It is concluded that this kind of construction technology of three-bench seven-step excavation could play a important role on rapid construction and tunnel structure safety.关键词
大断面黄土隧道/数值模拟/三台阶七步开挖法/施工Key words
large section tunnel in loess/ numerical simulation/ three-bench seven-step excavation method/ construction分类
交通工程
